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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets $ 1,133 $ 5,286
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Netting adjustments, assets 0 0
Assets at fair value 1,133 5,286
Fair Value, Measurements, Recurring | Commodity derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Netting adjustments, assets 0 0
Assets at fair value 1,133 5,286
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 | Commodity derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets 1,133 5,286
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 | Commodity derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets 1,133 5,286
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 | Commodity derivative contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis    
Derivative assets $ 0 $ 0